please help with all three. Please show in a clear format so that I may have a better understanding.

Use upper and lower sums to approximate the region using the given number of subintervals (of equal width). (Round your answers to three decimal places. ) Y - VZx upper sum * Your answer cannot be unders tood or graded. More Information lower sum 1 * Your answer cannot be und food or graded. More Information BEE 04 Need Help? Hand H Submit Answer 23. [-/2 Points] DETAILS LARCALC11 4.2 039. Use upper and lower sums to approximate the area of the region using the given number of subintervals (of equal width). (Round your answers to three decimal places.) upper sum lower sum 1 W Need Help? need " 24. [-/2 Points] DETAILS LARCALC11 4.2.042. Find the upper and lower sums for the region bounded by the graph of the function and the x-axis on the given interval. Leave your answer in terms of n, the number of subintervals. Function Interval (x) - 7 - 2x [1, 2] lower sum upper sum S(n) =